Patent GB-571987-A (GB)
Title: Improvements in or relating to the setting of eyelets having setting portions of thermoplastic material or in or relating to apparatus suitable for use in such setting
IPC: A43D100/02
Filed: 1943-12-23
Abstract: 571,987. Setting eyelets. BRITISH UNITED SHOE MACHINERY CO., Ltd. (United Shoe Machinery Corporation). Dec. 23, 1943, No. 21559. [Class 43] Eyelets and other tubular fasteners having setting end portions of thermoplastic material are subject at such end portions and after insertion in the work and before setting, to heat. Such heating may be performed by a heated tool adapted to be lowered into engagement with an eyelet positioned in a workpiece without setting it, and arranged to heat both the inside and outside of the setting end and then to be swung aside to permit a setting tool to descend and set the eyelet. The lower end of the heating tool may be formed to impress a groove in the upper surface of the work around the eyelet, the out-turned end of the eyelet when set lying in such groove. In a preferred form of apparatus, the heating and setting tools 11, 12 respectively are mounted in a single carrier 20 which is slidable on a vertical post 23 and about which it is pivoted, so as to be swung by a handle 59, successively into heating and setting positions over an eyelet inserted in a work-piece and retained in position by a spring-pressed presser foot 60 over a lower setting die 10. The correct location of the tools 11, 12 relatively to the die 10 is determined by engagement of two bosses . on the carrier 20 respectively with. one of a pair of adjustable stops on the machine frame. The carrier 20 may be depressed against a spring 53 by a hand lever 52 which is pivoted to a vertical pillar 55 fixed to the base 30 of the machine and carries a steel block 57 which operates against a portion 58 of the carrier. The tool 11, which is heated to a temperature of about 300‹ F. by an electric heating unit 13, is embedded in a block 15 of heat-conducting metal, a boss 14 on which is engaged by the tool. A shank 17 on the block 15 projects into a socket in a steel block 18 to which it is secured. by a screw 19 and the block 18 is secured by screws 21 to the vertically movable carrier 20 in a thermally insulated manner by an interposed block 22. The tool 11 has a sleeve portion but little greater than the external diameter of the eyelet and a pin 24 which projects below the sleeve and just engages the interior surface of the eyelet without upsetting it. The pin 24 may correct slight mis-alignment of the eyelet with the tool 11. A narrow circular bead on a rim at lower end of sleeve of-tool 11 impresses a groove in the upper surface of the work when the tool is in its lowered position. A locking pin 35 retractable by hand locks a spring-pressed pin 32 in retracted position in the lower die, which pin 32 centralises the eyelet in relation to the heating and setting tools 11, 12 and lower die 10. The setting tool 12 serves to cool and set the eyelet end and has an upsetting surface and a central pilot pin. It is fixed to a plunger 42 slidable within close limits in a vertical bore 43 in the carrier 20 against action of a spring 46 to prevent excessive pressure being applied to the tool.